In collider fill mode, the low energy booster (LEB) will accelerate 10/sup 12/ protons in 114 bunches from an injection momentum of 1.22 GeV/c to a final momentum of 12 GeV/c, cycling at a frequency of 10 Hz. The most significant extension of present fast-cycling synchrotron technology arises from the requirement that the normalized transverse emittance (RMS) of the beam be >or=0.6 pi mu m. In an alternative mode, the LEB will accelerate five times this current with a normalized transverse emittance >or=4 pi mu m. A general overview of the design is presented.
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